如何从Firebase数据库检索所有花瓶？

Question

I would simply like to retrieve all the data from my Products node I am unsure how to do this, this is how my database is set up.

Producuts(yes I am aware products is misspelled) 
 sH8LzoaH9UaXahlmssixTpvQy8q2 (UUID)
 -LiToCix_BpBU2G5b0GF (Push value)
 Description: 
 PostImage: 
 -Lj71JBxtvmbjTRLaA-6  (Push value)
 Description: 
 PostImage: 
 -Lj71K5QfoguoLKdUDL4.  (Push value)
 Description:  
 PostImage: 

As you can see from my code snippet I have already set a value event listener, I am unsure of how to retrieve all the values from the Products node.

public void fetchUserInfo(){

    productDatabaseRefrence = FirebaseDatabase.getInstance().getReference().child("Producuts").child(currentUser.getUid());
    productDatabaseRefrence.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            String mGroupId = productDatabaseRefrence.push().getKey();
            Log.i("id",mGroupId);


        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

}

Answer 1

According to the image, you have the following database:

Producuts(yes I am aware products is misspelled) 
   sH8LzoaH9UaXahlmssixTpvQy8q2 (UUID)
      -LiToCix_BpBU2G5b0GF (Push value)
         Description: 
         PostImage: 
      -Lj71JBxtvmbjTRLaA-6  (Push value)
         Description: 
         PostImage: 
      -Lj71K5QfoguoLKdUDL4.  (Push value)
         Description:  
         PostImage: 

To retrieve the description and postimage in your database, try the following:

@Override
public void onDataChange(DataSnapshot dataSnapshot) {
   for(DataSnapshot ds : dataSnapshot.getChildren()){
      String key  = ds.getKey();
      String desc = ds.child("Description").getValue(String.class);
      String img  = ds.child("PostImage").getValue(String.class);
   }
}

Using getKey() you can retrieve the random id example -LiToCix_BpBU2G5b0GF (Push value) and using child() you can retrieve the different children under each random id.